**FastAPI** knows what to do in each case and how to reuse the same object, so that all the background tasks are merged together and are run in the background afterwards:


{* ../../docs_src/background_tasks/tutorial002_an_py310.py hl[13,15,22,25] *}

   *         .put("one", 1)
   *         .putAll("several", 1, 2, 3)
   *         .putAll("many", 1, 2, 3, 4, 5)
   *         .build();
   * }
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build
   * multiple multimaps in series. Each multimap contains the key-value mappings in the previously
   * created multimaps.
   *
   * @since 2.0
   */

### El archivo de configuración

Proveniente del ejemplo anterior, tu archivo `config.py` podría verse como:

{* ../../docs_src/settings/app02/config.py hl[10] *}

Nota que ahora no creamos una instance por defecto `settings = Settings()`.

### El archivo principal de la app

		if actualErrCode == ErrNone {
			// validating the extracted/parsed credential fields.
			validateCredentialfields(t, i+1, testCase.expectedAuthField.Credential, parsedAuthField.Credential)

			// validating the extraction/parsing of signature field.
			if !compareSignatureV4(testCase.expectedAuthField.Signature, parsedAuthField.Signature) {

If a conditional GET was successful, responses from the network and cache are merged as directed by the spec.

## Follow-up Requests

 * that of its keys. This constraint enables bimaps to support an "inverse view", which is another
 * bimap containing the same entries as this bimap but with reversed keys and values.
 *
 * <h3>Implementations</h3>
 *
 * <ul>
 *   <li>{@link ImmutableBiMap}
 *   <li>{@link HashBiMap}
 *   <li>{@link EnumBiMap}
 *   <li>{@link EnumHashBiMap}
 * </ul>
 *

        webSocketListener = listener
      }

    /**
     * Configures this response to be served as a response to an HTTP CONNECT request, either for
     * doing HTTPS through an HTTP proxy, or HTTP/2 prior knowledge through an HTTP proxy.
     *
     * When a new connection is received, all in-tunnel responses are served before the connection is
     * upgraded to HTTPS or HTTP/2.
     */
    public fun inTunnel(): Builder =

 * create a dependency graph. First, only the root dependency can be given. Second, a root dependency and direct
 * dependencies can be specified in which case the specified direct dependencies are merged with the direct dependencies
 * retrieved from the artifact descriptor of the root dependency. And last, only direct dependencies can be specified in
 * which case the root node of the resulting graph has no associated dependency.
 *

     *
     * @param fessConfig the Fess configuration
     * @param hlPrefix the highlight prefix for field names
     * @param searchHit the search hit to parse
     * @return the parsed document as a map
     */
    protected Map<String, Object> parseSearchHit(final FessConfig fessConfig, final String hlPrefix, final SearchHit searchHit) {
        final Map<String, Object> docMap = new HashMap<>(32);

            newExtractors[newExtractors.length - 1] = extractor;

            Arrays.sort(newExtractors, Comparator.comparingInt(Extractor::getWeight).reversed());

            extractorMap.put(key, newExtractors);
        } else {
            extractorMap.put(key, new Extractor[] { extractor });
        }

        if (logger.isDebugEnabled()) {